Dynamic Voltage Restorer Based on Three-Phase Inverters Cascaded Through an Open-End Winding Transformer

This paper investigates a dynamic voltage restorer (DVR) composed of two conventional three-phase inverters series cascaded through an open-end winding (OEW) transformer, denominated here DVR-OEW. The DVR-OEW operating with either equal or different dc-link voltages is examined. The proposed topology aims to regulate the voltage at the load side in the case of voltage sags/swells, distortion, or unbalance at the grid voltage. A suitable control strategy is developed, including space-vector analysis, level-shifted PWM and its equivalent optimized single-carrier PWM, as well as the operating principles and characteristics of the DVR. Comparisons among the DVR-OEW and conventional configurations, including a neutral-point clamped converter-based DVR, are furnished. The main advantages of the DVR-OEW compared to the conventional topologies lie on: 1) reduced harmonic distortion, 2) reduced converter losses, and 3) reduced voltage rating of the power switches. Simulated and experimental results are presented to validate the theoretical studies.

[1]  V. Blasko,et al.  Analysis of a hybrid PWM based on modified space vector and triangle comparison methods , 1996, IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting.

[2]  Nicholas Jenkins,et al.  Dynamic voltage restorer based on 3-dimensional voltage space vector PWM algorithm , 2001, 2001 IEEE 32nd Annual Power Electronics Specialists Conference (IEEE Cat. No.01CH37230).

[3]  P. F. Seixas,et al.  Digital scalar pulse-width modulation: a simple approach to introduce nonsinusoidal modulating waveforms , 2001 .

[4]  S. S. Choi,et al.  Transformerless dynamic voltage restorer , 2002 .

[5]  G. Ledwich,et al.  Compensation of Distribution System Voltage Using Dynamic Voltage Restorer (DVR) , 2002, IEEE Power Engineering Review.

[6]  Frede Blaabjerg,et al.  Control and testing of a dynamic voltage restorer (DVR) at medium voltage level , 2004 .

[7]  C. Romaus,et al.  Five level neutral-point clamped inverter for a dynamic voltage restorer , 2005, 2005 European Conference on Power Electronics and Applications.

[8]  D.M. Divan,et al.  Zero Energy Sag Correctors - Optimizing Dynamic Voltage Restorers for Industrial Applications , 2007, 2007 IEEE Industry Applications Annual Meeting.

[9]  G. Venkataramanan,et al.  Dynamic Voltage Restorer Utilizing a Matrix Converter and Flywheel Energy Storage , 2007, 2007 IEEE Industry Applications Annual Meeting.

[10]  L.G. Franquelo,et al.  The age of multilevel converters arrives , 2008, IEEE Industrial Electronics Magazine.

[11]  Po-Tai Cheng,et al.  An Inrush Mitigation Technique of Load Transformers for the Series Voltage Sag Compensator , 2010, IEEE Transactions on Power Electronics.

[12]  E. Acha,et al.  Dynamic Voltage Restorer Based on Flying Capacitor Multilevel Converters Operated by Repetitive Control , 2009, IEEE Transactions on Power Delivery.

[13]  M.K. Mishra,et al.  Interphase AC–AC Topology for Voltage Sag Supporter , 2010, IEEE Transactions on Power Electronics.

[14]  Barry W. Williams,et al.  Evaluation of a Multilevel Cascaded-Type Dynamic Voltage Restorer Employing Discontinuous Space Vector Modulation , 2010, IEEE Transactions on Industrial Electronics.

[15]  Henry Shu-Hung Chung,et al.  Implementation and Performance Evaluation of a Fast Dynamic Control Scheme for Capacitor-Supported Interline DVR , 2010, IEEE Transactions on Power Electronics.

[16]  J. A. Solsona,et al.  Control Strategy of a DVR to Improve Stability in Wind Farms Using Squirrel-Cage Induction Generators , 2011, IEEE Transactions on Power Systems.

[17]  Cursino Brandao Jacobina,et al.  Pulsewidth Modulation Strategies , 2011, IEEE Industrial Electronics Magazine.

[18]  C. B. Jacobina,et al.  DVR with open-end winding transformer , 2011, IECON 2011 - 37th Annual Conference of the IEEE Industrial Electronics Society.

[19]  Julio C. Rosas-Caro,et al.  Two-switch three-phase ac-link dynamic voltage restorer , 2012 .

[20]  G. B. Gharehpetian,et al.  Three-Phase HFL-DVR With Independently Controlled Phases , 2012, IEEE Transactions on Power Electronics.

[21]  Xu Cai,et al.  Medium-voltage level dynamic voltage restorer compensation strategy by positive and negative sequence extractions in multiple reference frames , 2014 .

[22]  Malabika Basu,et al.  Control of the Dynamic Voltage Restorer to improve voltage quality , 2014, 2014 IEEE 5th International Symposium on Power Electronics for Distributed Generation Systems (PEDG).

[23]  Santosh Biswas,et al.  Optimal distributed generation placement in shunt capacitor compensated distribution systems considering voltage sag and harmonics distortions , 2014 .

[24]  Mahesh K. Mishra,et al.  A Control Scheme for Storageless DVR Based on Characterization of Voltage Sags , 2014, IEEE Transactions on Power Delivery.

[25]  Mariesa L. Crow,et al.  An Ultracapacitor Integrated Power Conditioner for Intermittency Smoothing and Improving Power Quality of Distribution Grid , 2014, IEEE Transactions on Sustainable Energy.

[26]  Leela Sarvani Palukuru,et al.  Srf Theory Revisited” To Control Self-Supported Dynamic Voltage Restorer (Dvr) For Unbalanced And Nonlinear Loads , 2015 .